Q: It doesn’t look any different to me?A: The Caffeine update isn’t about making some UI changes here or there. Currently, even power users won’t notice much of a difference at all. This update is primarily under the hood: we’re rewriting the foundation of some of our infrastructure. But some of the search results do change, so we wanted to open up a preview so that power searchers and web developers could give us feedback.

Q: Is this Caffeine Update because of Company X or Y is doing Z?A: Nope. I love competition in search and want lots of it, but this change has been in the works for months. I think the best way for Google to do well in search is to continue what we’ve done for the last decade or so: focus relentlessly on pushing our search quality forward. Nobody cares more about search than Google, and I don’t think we’ll ever stop trying to improve.

Q: How do I give Google feedback?A: If you want to give us feedback on how the search results are different, look on the search results page for a link at the bottom of the page that says “Dissatisfied? Help us improve.” Click on that link and type your feedback in the text box. Make sure to include the word caffeine somewhere in the feedback.

Update, August 11, 2009: I did a video interview about the Caffeine update with Mike McDonald. The Caffeine info begins about 1:15 into the video. You can also enjoy seeing my very-short summer haircut in the video.